Monochrome CRT with interference filter having filter layer with

Details Monochrome CRT with interference filter having filter layer with Monochrome CRT with interference filter having filter layer with

1990-01-02

1991-11-12

Wieder, Kenneth A.

Electric lamp and discharge devices

Cathode ray tube

Screen

313112, 313466, 358 73, 427 68, H01J 2989, H01J 2928

Patent

active

050650718

ABSTRACT:
The bulls-eye effect produced by projection television cathode ray display tubes with convexly curved faceplates and multi-layer interference filters is compensated by increasing the optical absorption of one of the filter layers having a decreasing center-to-edge thickness gradient. Since the layer is thicker in the center, more attenuation of the light output occurs there than at the edges of the display window, resulting in improved luminance uniformity of the display.

REFERENCES:
patent: 4634926 (1987-01-01), Vriens et al.
patent: 4683398 (1987-07-01), Vriens et al.
patent: 4804884 (1989-02-01), Vriens et al.
patent: 4914510 (1990-04-01), Brennesholtz et al.
patent: 4914511 (1990-04-01), Brennesholtz et al.
patent: 4937661 (1990-06-01), Van der Voort

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